The code feature isn't working.. it hasn't been working for a while now, and it's really annoying, especially when you're writing a long text and forget to copy it beforehand... The page just turns gray with no preview... It would be great if you could look into this...
[flower=capper09]

It sounds like this is similar to the already-reported issue here: closing forum post preview doesn&;t work
If this isn't the same issue, you'll need to give more detail about where you're writing a long text and not able to preview it.